Chrome: 68.0.3423.2 (Official Build) dev (64-bit) (cohort: Dev)

Steps to repro:
# Read chrome://accessibility
# Notice there is no text to let the user know the purpose of this page
# Notice that there is no text to help the user understand what checking or unchecking the boxes will do

Expected: Users should know what setting each control will change

Actual: While the controls are clearly named, it is not clear if they will change the accessibility tree shown when 'show tree' is clicked or actually change the chrome setting such that AT may stop functioning in the tab related to the control